Frequencies for first 10,000 rows of pct012k054 variable in sf12000860us26 dataset :

   51 years |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      8,907       89.07       89.07
          1 |        849        8.49       97.56
          2 |        168        1.68       99.24
          3 |         43        0.43       99.67
          4 |         12        0.12       99.79
          5 |          2        0.02       99.81
          6 |          2        0.02       99.83
          7 |          1        0.01       99.84
          8 |          4        0.04       99.88
          9 |          2        0.02       99.90
         10 |          1        0.01       99.91
         16 |          1        0.01       99.92
         17 |          1        0.01       99.93
         22 |          1        0.01       99.94
         28 |          1        0.01       99.95
         31 |          1        0.01       99.96
         42 |          1        0.01       99.97
         50 |          1        0.01       99.98
         58 |          1        0.01       99.99
         66 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 Apr 2017